| Title | Processing of fique bagasse waste into modified biochars for adsorption of caffeine and sodium diclofenac |
|---|---|
| ID_Doc | 12430 |
| Authors | Correa-Navarro, YM; Moreno-Piraján, JC; Giraldo, L |
| Title | Processing of fique bagasse waste into modified biochars for adsorption of caffeine and sodium diclofenac |
| Year | 2022 |
| Published | Brazilian Journal Of Chemical Engineering, 39.0, 4 |
| Abstract | Slow pyrolysis of a low value-added agricultural waste, fique bagasse, was carried out for the obtention of biochars. Next, biochar prepared was activated or modified by chemical or physical processes in order to produce six types of biochars. The fique bagasse biochar (FBB) were characterized using different analytical techniques. In addition, FBB were studied as an adsorbent for emerging pollutants caffeine and sodium diclofenac. Therefore, the use of FBB can be viewed as win-win condition and as an approach to valorize this residue and include it into a circular economy. In adsorption assays were showed that the pH studied had no significant difference in the adsorption capacity, while adsorption time, temperature and concentration were parameters that affected adsorption capacity of caffeine and diclofenac onto the six employed biochars. In addition, the biochar prepared by slow pyrolysis at 850 degrees C, with residence time of 3 h and activated with NaOH (FB850-3Na), was the best adsorbent evaluated, with adsorption capacity values of 80.65 and 57.13 mg g(-1) at 20 degrees C, for caffeine and diclofenac, respectively. It was also demonstrated that experimental data of FB850-3Na fit very well with the Sips isotherm model and followed a pseudo-first order kinetic model for both caffeine and diclofenac. These results demonstrate that biochars from fique bagasse are an option for the treatment of polluted water as well as an alternative to reduce waste from fiber fique production. |
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